/**
 * @author qiao / https://github.com/qiao
 * @author mrdoob / http://mrdoob.com
 * @author alteredq / http://alteredqualia.com/
 * @author WestLangley / http://github.com/WestLangley
 * @author erich666 / http://erichaines.com
 */

// This set of controls performs orbiting, dollying (zooming), and panning.
// Unlike TrackballControls, it maintains the "up" direction object.up (+Y by default).
//
//    Orbit - left mouse 
//    Zoom - middle mouse, or mousewheel 
//    Pan - right mouse, or arrow keys

THREE.OrbitControls = function (object, domElement) {
    this.object = object;
    this.domElement = (domElement !== undefined) ? domElement : document;
    this.enabled = true;
    this.target = new THREE.Vector3();
    this.minDistance = 0;
    this.maxDistance = Infinity;
    this.minZoom = 0;
    this.maxZoom = Infinity;
    this.minPolarAngle = 0; // radians
    this.maxPolarAngle = Math.PI; // radians
    this.minAzimuthAngle = - Infinity; // radians
    this.maxAzimuthAngle = Infinity; // radians
    this.enableDamping = false;
    this.dampingFactor = 0.25;
    this.enableZoom = true;
    this.zoomSpeed = 1.0;
    this.enableRotate = true;
    this.rotateSpeed = 1.0;
    this.enablePan = true;
    this.panSpeed = 1.0;
    this.screenSpacePanning = true; // if true, pan in screen-space
    this.keyPanSpeed = 7.0;	// pixels moved per arrow key push
    this.autoRotate = false;
    this.autoRotateSpeed = 2.0; // 30 seconds per round when fps is 60
    this.enableKeys = true;
    this.keys = { LEFT: 37, UP: 38, RIGHT: 39, BOTTOM: 40 };

    // Mouse buttons
    this.mouseButtons = { ORBIT: THREE.MOUSE.LEFT, ZOOM: THREE.MOUSE.MIDDLE, PAN: THREE.MOUSE.RIGHT };

    // for reset
    this.target0 = this.target.clone();
    this.position0 = this.object.position.clone();
    this.zoom0 = this.object.zoom;

    //
    // public methods
    //

    this.getPolarAngle = function () { return spherical.phi; };

    this.getAzimuthalAngle = function () { return spherical.theta; };

    this.saveState = function () {
        scope.target0.copy(scope.target);
        scope.position0.copy(scope.object.position);
        scope.zoom0 = scope.object.zoom;
    };

    this.reset = function () {
        scope.target.copy(scope.target0);
        scope.object.position.copy(scope.position0);
        scope.object.zoom = scope.zoom0;

        scope.object.updateProjectionMatrix();
        scope.dispatchEvent(changeEvent);

        scope.update();

        state = STATE.NONE;
    };

    // this method is exposed, but perhaps it would be better if we can make it private...
    this.update = function () {

        var offset = new THREE.Vector3();

        // so camera.up is the orbit axis
        var quat = new THREE.Quaternion().setFromUnitVectors(object.up, new THREE.Vector3(0, 1, 0));
        var quatInverse = quat.clone().inverse();

        var lastPosition = new THREE.Vector3();
        var lastQuaternion = new THREE.Quaternion();

        return function update() {

            var position = scope.object.position;

            offset.copy(position).sub(scope.target);

            // rotate offset to "y-axis-is-up" space
            offset.applyQuaternion(quat);

            // angle from z-axis around y-axis
            spherical.setFromVector3(offset);

            if (scope.autoRotate && state === STATE.NONE) {

                rotateLeft(getAutoRotationAngle());

            }

            spherical.theta += sphericalDelta.theta;
            spherical.phi += sphericalDelta.phi;

            // restrict theta to be between desired limits
            spherical.theta = Math.max(scope.minAzimuthAngle, Math.min(scope.maxAzimuthAngle, spherical.theta));

            // restrict phi to be between desired limits
            spherical.phi = Math.max(scope.minPolarAngle, Math.min(scope.maxPolarAngle, spherical.phi));

            spherical.makeSafe();


            spherical.radius *= scale;

            // restrict radius to be between desired limits
            spherical.radius = Math.max(scope.minDistance, Math.min(scope.maxDistance, spherical.radius));

            // move target to panned location
            scope.target.add(panOffset);

            offset.setFromSpherical(spherical);

            // rotate offset back to "camera-up-vector-is-up" space
            offset.applyQuaternion(quatInverse);

            position.copy(scope.target).add(offset);

            scope.object.lookAt(scope.target);

            if (scope.enableDamping === true) {

                sphericalDelta.theta *= (1 - scope.dampingFactor);
                sphericalDelta.phi *= (1 - scope.dampingFactor);

                panOffset.multiplyScalar(1 - scope.dampingFactor);

            } else {

                sphericalDelta.set(0, 0, 0);

                panOffset.set(0, 0, 0);

            }

            scale = 1;

            // update condition is:
            // min(camera displacement, camera rotation in radians)^2 > EPS
            // using small-angle approximation cos(x/2) = 1 - x^2 / 8

            if (zoomChanged ||
                lastPosition.distanceToSquared(scope.object.position) > EPS ||
                8 * (1 - lastQuaternion.dot(scope.object.quaternion)) > EPS) {

                scope.dispatchEvent(changeEvent);

                lastPosition.copy(scope.object.position);
                lastQuaternion.copy(scope.object.quaternion);
                zoomChanged = false;

                return true;

            }

            return false;

        };

    }();

    this.dispose = function () {

        scope.domElement.removeEventListener('contextmenu', onContextMenu, false);
        scope.domElement.removeEventListener('mousedown', onMouseDown, false);
        scope.domElement.removeEventListener('wheel', onMouseWheel, false);

        document.removeEventListener('mousemove', onMouseMove, false);
        document.removeEventListener('mouseup', onMouseUp, false);

        window.removeEventListener('keydown', onKeyDown, false);

        //scope.dispatchEvent( { type: 'dispose' } ); // should this be added here?

    };

    //
    // internals
    //

    var scope = this;

    var changeEvent = { type: 'change' };
    var startEvent = { type: 'start' };
    var endEvent = { type: 'end' };

    var STATE = { NONE: - 1, ROTATE: 0, DOLLY: 1, PAN: 2 };

    var state = STATE.NONE;

    var EPS = 0.000001;

    // current position in spherical coordinates
    var spherical = new THREE.Spherical();
    var sphericalDelta = new THREE.Spherical();

    var scale = 1;
    var panOffset = new THREE.Vector3();
    var zoomChanged = false;

    var rotateStart = new THREE.Vector2();
    var rotateEnd = new THREE.Vector2();
    var rotateDelta = new THREE.Vector2();

    var panStart = new THREE.Vector2();
    var panEnd = new THREE.Vector2();
    var panDelta = new THREE.Vector2();

    var dollyStart = new THREE.Vector2();
    var dollyEnd = new THREE.Vector2();
    var dollyDelta = new THREE.Vector2();

    function getAutoRotationAngle() {

        return 2 * Math.PI / 60 / 60 * scope.autoRotateSpeed;

    }

    function getZoomScale() {

        return Math.pow(0.95, scope.zoomSpeed);

    }

    function rotateLeft(angle) {

        sphericalDelta.theta -= angle;

    }

    function rotateUp(angle) {

        sphericalDelta.phi -= angle;

    }

    var panLeft = function () {

        var v = new THREE.Vector3();

        return function panLeft(distance, objectMatrix) {

            v.setFromMatrixColumn(objectMatrix, 0); // get X column of objectMatrix
            v.multiplyScalar(- distance);

            panOffset.add(v);

        };

    }();

    var panUp = function () {

        var v = new THREE.Vector3();

        return function panUp(distance, objectMatrix) {

            if (scope.screenSpacePanning === true) {

                v.setFromMatrixColumn(objectMatrix, 1);

            } else {

                v.setFromMatrixColumn(objectMatrix, 0);
                v.crossVectors(scope.object.up, v);

            }

            v.multiplyScalar(distance);

            panOffset.add(v);

        };

    }();

    // deltaX and deltaY are in pixels; right and down are positive
    var pan = function () {

        var offset = new THREE.Vector3();

        return function pan(deltaX, deltaY) {

            var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

            if (scope.object.isPerspectiveCamera) {

                // perspective
                var position = scope.object.position;
                offset.copy(position).sub(scope.target);
                var targetDistance = offset.length();

                // half of the fov is center to top of screen
                targetDistance *= Math.tan((scope.object.fov / 2) * Math.PI / 180.0);

                // we use only clientHeight here so aspect ratio does not distort speed
                panLeft(2 * deltaX * targetDistance / element.clientHeight, scope.object.matrix);
                panUp(2 * deltaY * targetDistance / element.clientHeight, scope.object.matrix);

            } else if (scope.object.isOrthographicCamera) {

                // orthographic
                panLeft(deltaX * (scope.object.right - scope.object.left) / scope.object.zoom / element.clientWidth, scope.object.matrix);
                panUp(deltaY * (scope.object.top - scope.object.bottom) / scope.object.zoom / element.clientHeight, scope.object.matrix);

            } else {

                // camera neither orthographic nor perspective
                console.warn('WARNING: OrbitControls.js encountered an unknown camera type - pan disabled.');
                scope.enablePan = false;

            }

        };

    }();

    function dollyIn(dollyScale) {

        if (scope.object.isPerspectiveCamera) {

            scale /= dollyScale;

        } else if (scope.object.isOrthographicCamera) {

            scope.object.zoom = Math.max(scope.minZoom, Math.min(scope.maxZoom, scope.object.zoom * dollyScale));
            scope.object.updateProjectionMatrix();
            zoomChanged = true;

        } else {

            console.warn('WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.');
            scope.enableZoom = false;

        }

    }

    function dollyOut(dollyScale) {

        if (scope.object.isPerspectiveCamera) {

            scale *= dollyScale;

        } else if (scope.object.isOrthographicCamera) {

            scope.object.zoom = Math.max(scope.minZoom, Math.min(scope.maxZoom, scope.object.zoom / dollyScale));
            scope.object.updateProjectionMatrix();
            zoomChanged = true;

        } else {

            console.warn('WARNING: OrbitControls.js encountered an unknown camera type - dolly/zoom disabled.');
            scope.enableZoom = false;

        }

    }

    //
    // event callbacks - update the object state
    //

    function handleMouseDownRotate(event) {

        //console.log( 'handleMouseDownRotate' );

        rotateStart.set(event.clientX, event.clientY);

    }

    function handleMouseDownDolly(event) {

        //console.log( 'handleMouseDownDolly' );

        dollyStart.set(event.clientX, event.clientY);

    }

    function handleMouseDownPan(event) {

        //console.log( 'handleMouseDownPan' );

        panStart.set(event.clientX, event.clientY);

    }

    function handleMouseMoveRotate(event) {

        //console.log( 'handleMouseMoveRotate' );

        rotateEnd.set(event.clientX, event.clientY);

        rotateDelta.subVectors(rotateEnd, rotateStart).multiplyScalar(scope.rotateSpeed);

        var element = scope.domElement === document ? scope.domElement.body : scope.domElement;

        // rotating across whole screen goes 360 degrees around
        rotateLeft(2 * Math.PI * rotateDelta.x / element.clientWidth);

        // rotating up and down along whole screen attempts to go 360, but limited to 180
        rotateUp(2 * Math.PI * rotateDelta.y / element.clientHeight);

        rotateStart.copy(rotateEnd);

        scope.update();

    }

    function handleMouseMoveDolly(event) {

        //console.log( 'handleMouseMoveDolly' );

        dollyEnd.set(event.clientX, event.clientY);

        dollyDelta.subVectors(dollyEnd, dollyStart);

        if (dollyDelta.y > 0) {

            dollyIn(getZoomScale());

        } else if (dollyDelta.y < 0) {

            dollyOut(getZoomScale());

        }

        dollyStart.copy(dollyEnd);

        scope.update();

    }

    function handleMouseMovePan(event) {

        //console.log( 'handleMouseMovePan' );

        panEnd.set(event.clientX, event.clientY);

        panDelta.subVectors(panEnd, panStart).multiplyScalar(scope.panSpeed);

        pan(panDelta.x, panDelta.y);

        panStart.copy(panEnd);

        scope.update();

    }

    function handleMouseUp(event) {

        // console.log( 'handleMouseUp' );

    }

    function handleMouseWheel(event) {

        // console.log( 'handleMouseWheel' );

        if (event.deltaY < 0) {

            dollyOut(getZoomScale());

        } else if (event.deltaY > 0) {

            dollyIn(getZoomScale());

        }

        scope.update();

    }

    function handleKeyDown(event) {

        //console.log( 'handleKeyDown' );

        switch (event.keyCode) {

            case scope.keys.UP:
                pan(0, scope.keyPanSpeed);
                scope.update();
                break;

            case scope.keys.BOTTOM:
                pan(0, - scope.keyPanSpeed);
                scope.update();
                break;

            case scope.keys.LEFT:
                pan(scope.keyPanSpeed, 0);
                scope.update();
                break;

            case scope.keys.RIGHT:
                pan(- scope.keyPanSpeed, 0);
                scope.update();
                break;

        }

    }

    //
    // event handlers - FSM: listen for events and reset state
    //

    function onMouseDown(event) {

        if (scope.enabled === false) return;

        event.preventDefault();

        switch (event.button) {

            case scope.mouseButtons.ORBIT:

                if (scope.enableRotate === false) return;

                handleMouseDownRotate(event);

                state = STATE.ROTATE;

                break;

            case scope.mouseButtons.ZOOM:

                if (scope.enableZoom === false) return;

                handleMouseDownDolly(event);

                state = STATE.DOLLY;

                break;

            case scope.mouseButtons.PAN:

                if (scope.enablePan === false) return;

                handleMouseDownPan(event);

                state = STATE.PAN;

                break;

        }

        if (state !== STATE.NONE) {

            document.addEventListener('mousemove', onMouseMove, false);
            document.addEventListener('mouseup', onMouseUp, false);

            scope.dispatchEvent(startEvent);

        }

    }

    function onMouseMove(event) {

        if (scope.enabled === false) return;

        event.preventDefault();

        switch (state) {

            case STATE.ROTATE:

                if (scope.enableRotate === false) return;

                handleMouseMoveRotate(event);

                break;

            case STATE.DOLLY:

                if (scope.enableZoom === false) return;

                handleMouseMoveDolly(event);

                break;

            case STATE.PAN:

                if (scope.enablePan === false) return;

                handleMouseMovePan(event);

                break;

        }

    }

    function onMouseUp(event) {

        if (scope.enabled === false) return;

        handleMouseUp(event);

        document.removeEventListener('mousemove', onMouseMove, false);
        document.removeEventListener('mouseup', onMouseUp, false);

        scope.dispatchEvent(endEvent);

        state = STATE.NONE;

    }

    function onMouseWheel(event) {

        if (scope.enabled === false || scope.enableZoom === false || (state !== STATE.NONE && state !== STATE.ROTATE)) return;

        event.preventDefault();
        event.stopPropagation();

        scope.dispatchEvent(startEvent);

        handleMouseWheel(event);

        scope.dispatchEvent(endEvent);

    }

    function onKeyDown(event) {

        if (scope.enabled === false || scope.enableKeys === false || scope.enablePan === false) return;

        handleKeyDown(event);

    }

    function onContextMenu(event) {

        if (scope.enabled === false) return;

        event.preventDefault();

    }

    //

    scope.domElement.addEventListener('contextmenu', onContextMenu, false);

    scope.domElement.addEventListener('mousedown', onMouseDown, false);
    scope.domElement.addEventListener('wheel', onMouseWheel, false);


    window.addEventListener('keydown', onKeyDown, false);

    // force an update at start

    this.update();

};

THREE.OrbitControls.prototype = Object.create(THREE.EventDispatcher.prototype);
THREE.OrbitControls.prototype.constructor = THREE.OrbitControls;

Object.defineProperties(THREE.OrbitControls.prototype, {

    center: {

        get: function () {

            console.warn('THREE.OrbitControls: .center has been renamed to .target');
            return this.target;

        }

    },

    // backward compatibility

    noZoom: {

        get: function () {

            console.warn('THREE.OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.');
            return !this.enableZoom;

        },

        set: function (value) {

            console.warn('THREE.OrbitControls: .noZoom has been deprecated. Use .enableZoom instead.');
            this.enableZoom = !value;

        }

    },

    noRotate: {

        get: function () {

            console.warn('THREE.OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.');
            return !this.enableRotate;

        },

        set: function (value) {

            console.warn('THREE.OrbitControls: .noRotate has been deprecated. Use .enableRotate instead.');
            this.enableRotate = !value;

        }

    },

    noPan: {

        get: function () {

            console.warn('THREE.OrbitControls: .noPan has been deprecated. Use .enablePan instead.');
            return !this.enablePan;

        },

        set: function (value) {

            console.warn('THREE.OrbitControls: .noPan has been deprecated. Use .enablePan instead.');
            this.enablePan = !value;

        }

    },

    noKeys: {

        get: function () {

            console.warn('THREE.OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.');
            return !this.enableKeys;

        },

        set: function (value) {

            console.warn('THREE.OrbitControls: .noKeys has been deprecated. Use .enableKeys instead.');
            this.enableKeys = !value;

        }

    },

    staticMoving: {

        get: function () {

            console.warn('THREE.OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.');
            return !this.enableDamping;

        },

        set: function (value) {

            console.warn('THREE.OrbitControls: .staticMoving has been deprecated. Use .enableDamping instead.');
            this.enableDamping = !value;

        }

    },

    dynamicDampingFactor: {

        get: function () {

            console.warn('THREE.OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.');
            return this.dampingFactor;

        },

        set: function (value) {

            console.warn('THREE.OrbitControls: .dynamicDampingFactor has been renamed. Use .dampingFactor instead.');
            this.dampingFactor = value;

        }

    }

});